package com.xx.interceptor;

import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle-login");
        // 只允许用户访问登录请求
        if (request.getRequestURI().contains("/login")) {
            return true;
        }
        if (request.getSession().getAttribute("USER_SESSION") != null) {
            return true;
        }
        request.setAttribute("msg", "未登录！");
        request.getRequestDispatcher("/index.jsp").forward(request, response);
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           @Nullable ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle-login");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
                                @Nullable Exception ex) throws Exception {
        System.out.println("afterCompletion-login");
    }
}
